Vulnerability · Published Aug 17, 2021 · Assigned by mozilla
CVE-2021-29984
High 8.8
In plain English
A high-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.8High
Exploit odds (30 days)1.4%top 27.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly considered during garbage collection. This led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 92.0.1-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.21 | firefox | 92.0.1-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.22 | firefox | 92.0.1-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.23 | firefox | 92.0.1-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.20 | firefox-esr | 78.13.0-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.21 | firefox-esr | 78.13.0-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.22 | firefox-esr | 78.13.0-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.23 | firefox-esr | 78.13.0-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.21 | librewolf | 92.0.1-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.22 | librewolf | 92.0.1-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.23 | librewolf | 92.0.1-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.24 | librewolf | 92.0.1-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.20 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.21 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.22 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29984 |
| Alpine:v3.23 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29984 |
| Debian:12 | firefox-esr | 78.13.0esr-1 | DEBIAN-CVE-2021-29984 |
| Debian:13 | firefox-esr | 78.13.0esr-1 | DEBIAN-CVE-2021-29984 |
| Debian:14 | firefox-esr | 78.13.0esr-1 | DEBIAN-CVE-2021-29984 |
| Debian:12 | thunderbird | 1:78.13.0-1 | DEBIAN-CVE-2021-29984 |
| Debian:13 | thunderbird | 1:78.13.0-1 | DEBIAN-CVE-2021-29984 |
| Debian:14 | thunderbird | 1:78.13.0-1 | DEBIAN-CVE-2021-29984 |
| Rocky Linux:8 | firefox | 0:78.13.0-2.el8 | RLSA-2021:3157 |
| Rocky Linux:8 | firefox | 0:78.13.0-2.el8_4 | RLSA-2021:3157 |
| Rocky Linux:8 | thunderbird | 0:78.13.0-1.el8_4 | RLSA-2021:3155 |
| Rocky Linux:8 | thunderbird | 0:78.13.0-1.el8 | RLSA-2021:3155 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-29984 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | unspecified – before 78.13unspecified – before 91 |
| Mozilla | Firefox ESR | unspecified – before 78.13 |
| Mozilla | Firefox | unspecified – before 91 |
References
- https://www.mozilla.org/security/advisories/mfsa2021-33/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-35/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-34/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-36/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1720031 x_refsource_MISC
- GLSA-202202-03 vendor-advisory, x_refsource_GENTOO
- GLSA-202208-14 vendor-advisory, x_refsource_GENTOO